JPS62191768A - Apparatus for outputting rotation information - Google Patents

Abstract

PURPOSE:To obtain rotation information having excellent characteristics, by providing an angle signal converting means, an operation means for operating the difference between first and second signals being the outputs of a frequency signal converting means and a correction means for correcting the first and second signals on the basis of the output from the operation means. CONSTITUTION:The signal of a signal generating means 100 outputting sine wave-form A- and B-phases having 90 deg. phase difference by the rotation of a rotary body 110 is differentiated by an angle signal converting means 1 to output a positive first signal V1 by positive rotation and a negative first signal V1 by reverse rotation. The A-phase and the B-phase are converted into rectangular waves by a wave-form shaping circuit 2, and a positive voltage second signal V2 and a negative voltage second signal V2 are respectively outputted by positive and reverse rotations by a F/N converting circuit 3. The signals V1, V2 are operated by an operation circuit 4 to output a signal V3. A primary delay circuit 5 has an amplifying ratio of 1 in a steady state and the output V4 of the circuit 5 comes to V3=V4 at a steady time and the max. value is limited by a limiter 6. Because a limiter signal generating circuit 8 outputs a limiter signal V6 from the signal V2 of the circuit 3, the output signal V5 of a correction limiter circuit is limited to zero at a low speed. A speed feedback signal Vf=V1-V5 is subtracted in a subtractor circuit 7 and a signal having good linearity is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is characterized in that the number of 8 is proportional to the rotational speed of the rotating body, and the rising and falling angles near the cross (b) are proportional to the rotation of the rotating body. This relates to a rotation information output device having a signal generating means such as a sine encoder that outputs a signal that increases as the ft degree increases, and relates to a device lLK that outputs rotation information such as rotation speed and rotation position tIL. Out.

[Conventional technology]

The rising edge of the output of the signal generating means as described above.

An angle signal exchange means for outputting a second signal with an amplitude corresponding to the falling angle, and a frequency conversion means for outputting a second signal with an amplitude corresponding to the frequency of the signal generating means. In the high-speed range, a second signal is used to extract the rotation information of the rotating body.
This is proposed in Publication No. 9.

As shown in FIG. 2, the magnitude of the first signal is well proportional to the rotational speed of the rotating body in a low speed range, but exhibits a characteristic that it is no longer proportional in a high speed range.

Conversely, the magnitude of the second signal is well proportional in the high speed range, as shown in FIG. 3, but not in the low speed range.

Therefore, as shown in Japanese Unexamined Patent Publication No. 57-175259-ff, the first. Cutting off and using the second signal midway is extremely effective in outputting rotation information.

[Possible problem to be solved by the invention]

However, in the conventional device described above, when switching from the first signal to the second signal or from the second signal to the first signal, there is a problem in which the rotation information output device stops outputting an output signal for a short period of time.

Of course, it is possible to insert a capacitor in order to sustain the signal during switching, but doing so would impair the immediate response characteristics and is not desirable.

The present invention has been made in view of these concerns, and its purpose is to output rotation information with excellent characteristics without causing any traces of output signals to be output from low speed ranges to high speed ranges. The purpose of the present invention is to provide a (verbal) transfer information output device.

[Failure to solve the problem]

That is, in the present invention, the signal generation means, the angle signal exchange means,
In addition to the frequency signal conversion means, calculation means and correction means are provided.

The calculation means calculates the difference between the first signal and the second signal, and the correction means corrects the first signal or the second signal using the output of the calculation means.

[Effect]

As mentioned above, the first signal output from the angle signal converting means is well proportional to the speed in the low speed range, but in the high speed range (b) the rate at which the signal increases with respect to the increase in cutting speed becomes small.

On the contrary, the second signal, which is the output of the frequency signal converting means, exhibits a force that is well proportional to the force in the high speed range ζ and a value smaller than that on the proportional line in the low speed range.

Therefore, in the low speed range, the second signal is smaller than the first signal,
In the high speed range, the ii2 signal becomes larger than the first signal.

Therefore, a point P where the lth signal and the second signal intersect as shown in FIG. 5 occurs.

1w, 1 signal v8. When the second signal is V2, the calculation means calculates V, =V, -V, etc.
.........(1) to Yi4, when the value is negative, Vf=V, -V,...
・・・・・・・・・・・・・・・・・・・・・・・・(2)
By *, we get Vf=V.

Therefore, in the range of speeds lower than P and 4, output 1■, and when the speed becomes faster than point P, correct 78 minutes to ■1. It can output excellent rotation information. Since this characteristic curve is based on the characteristic curve ivt both in the high-speed range and the low-speed range from point P, it is possible to obtain the signal without any trace.

Also, when the value of equation (1) is positive, Vf' = V, +V3...
・・・・・・・・・・・・Find (3): Vf' =
V, becomes.

Therefore, in the range of speeds faster than point P, output 1■2, and when the speed is slower than point P, correct V, KV, and minutes. It is possible to output excellent rotational information, and since this characteristic curve can be obtained based on the characteristic curve ■ in both the high speed range and the low speed range from point P, it is possible to obtain the signal without cutting off any traces. I can do it.

〔Example〕

Embodiments of the present invention will be described below with reference to FIG.

A sine waveform A phase B with a phase difference of 900 and whose amplitude hardly changes due to the rotation of a rotating body 110 such as an electric motor.
The signal of the signal generating means Zoo that outputs the phase is differentiated by the angle signal converting means 1, and the differential waveform near the zero cross of the A phase and B phase is switched to obtain a first signal V, which is positive for forward rotation and negative for reverse rotation. Output. On the other hand, physiognomy.

The waveform shaping circuit 2 converts the sine waveform of the B bill into a rectangular waveform, and the F/V conversion circuit 3 outputs a second signal (2) of a positive voltage for forward rotation and a negative voltage for reverse rotation. Single frequency signal conversion hand screw 1
01 is the first signal composed of the waveform shaping circuit 2 and the F/V change path 3. ■1 is hm-like due to the deterioration of the frequency characteristics of the A and B phases in the high-speed range, as shown in Figure 2. It gets worse. Since the second signal V has a low speed and a long pulse interval, the ripple increases and eventually it becomes impossible to output, resulting in the characteristics as shown in FIG.

The first of both. The second signal V,,V, is calculated by the calculation means 4,
It calculates V and -V and outputs a signal V, resulting in the characteristics shown in FIG.

Since the first-order lag circuit 5 has an amplification factor of 1 in a steady state, the output V4 of the -order number circuit 5 becomes V, =V in a steady state, and the correction limiter circuit 6 limits the maximum value. The limiter signal generation circuit 8 outputs the output V of the F/vf path 3,
In order to output the limiter signal (6) shown in FIG. 1, the correction limiter (b) pedal output signal (2) is limited to zero at a low speed. Therefore, the characteristics shown in FIG. 6 become as shown in FIG. 7. A subtraction circuit 7 subtracts the speed feedback signal vf=v, -v from this signal V. In this embodiment, the correction means 102 is composed of a correction limiter (b) path 6, a limiter signal (b) path 8, and a subtraction circuit 7.

In Figure 7, V is a negative voltage, so the voltage of ■1 is changed to ■
, the absolute value of , is added, and a speed feedback signal with good reproducibility as Vf in FIG. 5 is obtained.

At lower speeds than the above, the output of the calculation means 4 is limited to zero by the correction limiter circuit 6, so that it becomes a speed feedback signal based on the slope differential method.

On the other hand, in the high-speed range, since the correction limiter circuit 6 does not limit the limiter, V, = V, -V, (high-speed steady state only), and the speed feedback signal Vf = V, -V, =
V, which is the output of the F/V method.

FIG. 9 shows the IJ mitter signal generating circuit 8 of FIG. 1 detected from the output signal -wjv of the angle signal converting means 1, and the operation is basically the same as that of FIG. 1.

Next, (a) of FIG. 10 is a diagram when the actual rotational speed N rapidly increases from a medium speed to a high speed. In this case, the first signal v1 responds immediately as shown in (b), but the second signal v
, is quite delayed as shown in (b). However, if the speed N does not change rapidly, the second signal V based on the F/V method outputs a more accurate value than the first signal V. The output ■ of the arithmetic means 4 is as shown in the figure, and the output is converted to (cl
It becomes like V4.

Since the signal 4 is in a high-speed state, it is not affected by the correction limiter circuit 6 and is set to 1'2vIl=v4 by the subtraction circuit 7.
is subtracted (K as shown by the solid line Vf of dl).

As you can see from now on, in the high speed range, the first-order delay circuit 5
It can be seen that by configuring , the response of the second signal V of the F/V method becomes faster than that of the second signal V, and the response of the detection circuit is improved.

Next, the concrete implementation of the block diagram in Fig. 1 is shown in Fig. 11.
This will be explained using FIGS. 13 and 14.

1 is a concrete example of the angle signal conversion means 1.

An example of this circuit is shown in Figure 11, and its time chart is shown in Figure 1.
Shown in Figure 2.

In FIG. 11, 111 and 112 are inverting circuits, 113 is a first switch control signal generation (b) path, 114 is a second switch control signal generation circuit, 115 is a group of analog switches for human phase,
116 is a group of B-phase analog switches, 117 and 118 are differentiating circuits, 119 is a slit removal analog switch group, 120 is an inverting amplifier circuit, and 121 is an inverting amplifier circuit for matching polarity.

As for the human phase signal, the A-phase signal A and the A-phase inverted signal τ are input through the analog switch group 115, and the portions of the same slope of the A and X signals are extracted, and the output of the analog switch group 115 is A phase slope signal AA shown in FIG.
becomes.

For the B-phase as well, similarly to the human phase, the B-phase signal B and the B-phase inversion signal T are inputted via the analog switch group 116.
It takes out the diagonal part around 1, same as B and 100 signal.
The output of analog switch group XX6 is B shown in Figure 2.
This becomes a phase slope signal BB.

In order to detect the speed, these A and B phase slope signals A
A, BB are differentiating circuits 117 consisting of capacitors and resistors,
Differentiate by 118. Those differentiating circuits 117,1
The output of 18 becomes differential signals dAA and dBB shown in FIG.

These dAA and dBB signals have slits as shown in the figure, so in order to remove these slits, only the 90° near the peak of each differential signal dBB and dAA is removed using the slit removal analog switch 119. The signal is taken out through the inverter circuit 120, synthesized, and amplified by the inverting circuit 120 to obtain the speed detection signal Eo. During normal rotation, the inverting circuit of 121
This is an inverting circuit that outputs a first signal v1 which is a positive output and a negative output during reverse rotation.

The control of the human phase analog switch group 115 is performed by the output signal SF of the first switch control signal generation circuit 113, and this output signal BF, 100τ, is controlled by the B-phase signals B and B. It is generated by comparing the phase inversion signal (2) with the phase inversion signal (2).

1, the control of the B-phase analog switch group 116 is
Output signals SE and BK of switch control signal generation circuit 113
This output signal BE.

n is generated by comparing the A-phase signal A and the A-phase inverted signal X.

Furthermore, the slit removal analog switch group 119 for removing slits is configured to control the A phase signal A (!-B phase signal B,
Compare the A-phase signal A and B@inverted signal 100, (-i it,
Exclusive OR of each output
A second switch control signal generation circuit 114 that takes OR)
The output signal SG is controlled by the child.

Figure 13 shows the waveform shaping circuit 2 and F/V conversion circuit 3 in Figure 1.
This is a specific example. The waveform shaping circuit 2 and the F/V variation circuit 3 constitute the frequency signal conversion means 101 as described above.

A sine wave human face with a 90° phase difference from the signal generating means 100, the B phase is filtered R1eC! 1'! Or R7゜C2
tjMJi L, Te, Hysteresis Combare pOP,
.

cp, Converts into a rectangular wave with a 90° phase difference using resistors R8 to R8. The number of pulses of this rectangular wave is doubled by an exclusive OR gate C7 and inputted to the F/V converter of the gate C3. F/V converter input -0
, 6V threshold is detected, and a magnetic pressure proportional to the input frequency is output to the 13th bin. In addition, capacitor C3, resistor "ll + R10
is differentiated (
b) It consists of roads. The gain of this F/V converter C is determined by R11, and the filter time constant is R3.
,.

Since it is determined by C3, if you want to reduce the ripple, increase the capacitor C5. However, the responsiveness deteriorates.

The capacitor C4 determines the pulse width of the one-shot multivibrator which generates a constant width pulse synchronized with the falling input of the F/V converter. Since the output of this F/V converter is a positive absolute value, an analog switch using FKT1 to FKT and a resistor R20""R23 are provided on the input side of the amplifier OP, so that FE
T, is on, FET, ,FET, is off, OF,
operates as an inverting amplifier, and when reversing, FET is turned off, FIT, and PET are turned on, and op is operated as a non-inverting amplifier. During forward rotation, the 2 outputs are negative, and when reversing,
An F/V conversion circuit 3 with a power converter whose output is direct pressure is constructed. In addition, the seven-point cross comparator cp3 outputs the angle value g by the tilting portion from the output of the variation means 1.
, from Lg1 turning direction r, resistance R1□, R, ,
Convert the level with diode D, transistor Q,
The inverter C3y and C4 operate the switch FETs, .about.FETs.

Next, the second signal v2 which is the output of the F/Vf conversion circuit 3 is
4. The arithmetic means 4 shown in FIG. 4 includes an amplifier OF.

and resistors R5 and +R54, and the first signal V1 which is the output of the angle signal converting means 1.
The capacitor CT shown by the broken line between the output and input negative terminals of 1 is a capacitor for forming the first-order lag circuit shown in Figure 1.
! F, and by adding CT, it becomes a -order lag circuit.゛Also, since the F/V converter E C8 in FIG. 13 has a positive absolute value output, the limiter signal generation circuit 8 inputs this output 13-bin signal vt+ to the amplification aopst and the resistors RI15 to R38. , and the diode DBBrD54 constitute a circuit having a dead zone at the input terminal 7 and Takechika as shown in FIG. Note that V2. in Figure 15. x
can be adjusted with a variable resistor VR, and the output of the calculation means 4 determines the starting point for correcting the signal V. Instead of using a variable resistor, it may be divided by a resistor. Note that the reason why the output ■6 does not change when the v2□ input in FIG. 15 is large is because the amplifier op52 is saturated. This signal v6 applies a limiter to the output of the differential pressure detection circuit 4 in a correction limiter circuit 6.

1's signal V is generated by inverting amplifier circuit 0P55 + 0Ps4 + resistors R69 to R64 in OP3. V61 is the limiter signal on the negative side of the output voltage 3, and V is the limiter signal on the positive side. Resistors RIH to R11 that output t'ki@x4 as shown in the figure and divide the output signal ■ of the calculation means 4.
8 and diodes D51+D52 constitute an incomplete limiter circuit.

For example, when signal V gradually increases to the negative side, R6! between signal V61! ~The voltage at the point divided by R116 gradually goes from positive voltage to zero, and when it moves from zero to negative acid ratio, diode D5+ turns on, and the current flowing through R64 of OP, , which is now 1, turns on. Since the current flows to DllI, the specific output cannot increase any further and becomes a limiter operation.

However, the limiter circuit composed of D51 + D52 and Rea to R6g is not a complete limiter circuit, and the output increases slightly even if it exceeds the limiter point, so in order to make it a complete limiter, op ■, opsa, resistor R6G1 ~
R1 and DIll-Dell constitute a limiter correction circuit. In other words, this circuit is designed to cancel out the amount that rises beyond the limiter shield due to signals 6I and v3, and the amount that rises beyond the limiter point due to vo and v3. Signal ■ in Figure 1 is ■3 in Figure 14 +v6B
”It is expressed as the sum of V64.

Incidentally, the first signal V, which is the output of the angle signal converting means 1, is passed through the resistor R80, ○P5? +R? ? ~Rst
is subtracted by , and output as the output Vf.

The entire explanation is as already explained with reference to FIGS. 1 to 8.

The invention is not limited to the above embodiments, and may be modified to a certain extent. If it is not necessary to detect the direction of rotation, it is possible to use a device that outputs a single bill signal as a signal generating means.

Of course, one that outputs three-phase signals can also be used conveniently. In this case, it is of course easy to detect the direction of rotation. Further, in the illustrated embodiment, the case where the limiter 6 is used has been explained, but if the one-way conduction means 140 is connected as shown by the v line in FIG. 1 instead of the limiter 6, in the low speed range where v3 is positive, The first signal V is outputted as ■f and its ``f1'' becomes negative, and the first signal V is corrected by V in the range where it becomes negative, and the first signal V is no longer proportional to the rotation speed. will be applied.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, even if the rotational speed of the rotating body changes, the speed rF is maintained without switching from the first signal to the second signal or from the second signal to the first multiplier.
You can get the notification signal,

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the output device of the present invention;
Figures 2 to 1 and 6 to 7 are diagrams showing the input/output characteristics of each element in Figure 1, Figure 5 is a diagram showing the overall input/output characteristics of Figure 1, and Figure 8. is an input/output characteristic diagram different from that in FIG. 5, FIG. 9 is a block diagram showing a different embodiment of the present invention, and FIG. 10 is a time chart showing a transient state in a high-speed range.
Fig. 11 is a circuit diagram showing a specific example of the angle signal conversion means, Fig. 12 is a time chart showing the operation of the circuit shown in Fig. 11, Fig. 13 is a frequency signal conversion means, and Fig. 14 is mainly for correction. FIG. 15 is a circuit diagram showing a specific example of the means. FIG. 16 is a diagram with input/output percentages of the correction limiter circuit. 1 is an angle signal f conversion means, 4 is a cancellation screw, 100 is a signal generation means, 101 is a frequency signal conversion means, 102 is a correction means, and 110 is a rotating body. 1st Figure 7 Ryogai Ig-! Kazusada Mugisa 4 Kochi Dan/Rio
Ig- to tt to / Painting teaching j
Mr. Mugibarito 102 Toko Tebo 72,9 Fish body Fuotsu Figure 7 Figure 1/fl Figure 72 g)l Tei 15 Σ Figure 72

Claims (1)

[Claims] 1. A signal generating means for outputting a signal whose frequency is proportional to the rotational speed of the rotating body, and whose rising and falling angles near the zero cross increase as the rotational speed of the rotating body increases. , angle signal converting means for outputting a first signal with an amplitude corresponding to at least one of the rising and falling angles; and frequency signal converting means for outputting a second signal with an amplitude corresponding to the frequency of the signal generating means. A rotation information output device comprising: a calculation means for calculating a difference between the first signal and the second signal; and a correction means for correcting the first signal or the second signal with the output of the calculation means. 2. The rotational information output device according to claim 1, wherein the signal generating means outputs at least two-phase signals that produce different patterns depending on the rotational direction of the rotating body. 3. The correction means is configured to correct the first signal using the output of the calculation means only in a range where the first signal or the second signal exceeds a certain value. The rotation information output device according to scope 1. 4. The correction means is configured to correct the first signal using the output of the calculation means only when the second signal is larger than the first signal. The rotation information output device according to item 1. 5. A patent claim characterized in that the correction means is configured to correct the second signal using the output of the calculation means only in a range where the first signal or the second signal is below a certain value. The rotation information output device according to item 1. 6. Any one of claims 1 to 5, wherein the signal generating means is configured to output a signal with a substantially constant amplitude regardless of the rotational speed of the rotating body. or one rotation information output device.